If not, clogged egr, stuck open is the culprit. You can see under-boost / over-boost that are a symptom of a plethora of problemsģ.- maf and egr performance - here you can read if your egr is opening and closing according to the spec.
check turbo perfomance (group 11) confirm your turbo is up to the task by plotting the expectes vs real boost during a test drive. Usually deviations are caused by clogged injectors. Spec is +/-2.0, but anything above +/-1.00 will also show other symptoms. Here is what I'm trying to check:ġ.- check idle stabilization readings (group 13?) It will show you if the computer is compensating injector pulses for smoothing the idle. Can you confirm these few group numbers and where do I find them on my own? The wiki page for my generation car didn't seem to list them, unless they were hidden or something. I am trying to find a list of the codes for my VW MK4 Jetta TDI Wagon (BEW motor).
